Wol″las‐ton's dou″blet (?). [After W. H. Wollaston, English physicist.] (Optics) A magnifying glass consisting of two plano-convex lenses. It is designed to correct spherical aberration and chromatic dispersion.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.